There are places in our real world where child who has been raped are forced to have a child thanks to laws, there are pretty much no laws anywhere on how old a woman can be to have ifv, and there are probably as many if not more risks for having kids too young or too old in life as there are from incest.
My dad was born in 1937 my mum in 1941, me in 1979, my dad died in 2011, when I was 22 I had to learn the signs on heart attacks and strokes after a car crash and being told at some point prior to the crash dad had had a silent heart attack.
Hell it's been what, 50 times you filled your daughter with cum and nothing has happened, and don't give me no pill rubbish, an old friend of mines sister got pregnant with her 4th, while she was on the pill and using a condom.